Lewis griscom



tatto -atrnt ffirn.

LEWIS GRISCOM, OF MAHANOY- PLANE, PENNSYLVANIA.

Leners Parent No. 77,812, atea May 12, 1868.

` IMPROVEMENT 1u Largas.

tlge .Stlgrmtle referat it. in that tttets ateut mit mating gaat mitigtame.

To ALL WHOM 1T MAY ooNcEBN:

13e it known that I, LEwIsGnrscoM, ot' vMahoney Plane, in the county ofSchuylkill, andState oPennsylvania, have invented a new and improvedAutomatieCross-Feed for Lathes orBorin'g-Machines; and AI do herebydeclare that the following is a full, c lear, and exact descriptionthereof, which will enable those skilled" in the art to make and use thesame, reference being had to t'heao'comp'anying drawings, forming partof thi specification. o K v The object of this invention `is toaccomplish the cutting of' tapers on shafts, and the boring of the correspending tapering hole for the reception `of the tapered shaft, inasimple, accurate.` and automatic manner, which will hereinafter befully set forth'. v v

Heretofore, the method of boring or turning tapers commonly practisedwas t'o operate the cross-feed by means ota hand-wheel or crank, whichrequired a'skillt'ul workman to operate with any degree of successl inprocuringa goed iit ofthe tapered parts.

' Those' skilled in the art of fitting the taper of' metalshafts to acorresponding hole for the reception of the same are conversant with'the care, time, and expense necessary to producea good t of the parts,all of which is mainly duc to the unavoidable inaccuracy attendant uponthe operating of the cross-fced of the tool byhand, These disadvantagesare obviatcd by my improvements, which will' now be set forth. I In theaccompanying plate of c'lra\vingsv l Figure 1 represonts.a top view ofmy improvements attached to the slide'restof an ordinary lathe. andFigure 2 represents a side view of the same. I Similar letters ofreference indicate .corresponding parts. v '.lheslide-rest D isactuated, bythe longitudinal feedfs'crcw B, to move along on lthe slidesor shears A- ot the bed-t`rarne, in theusual manner, andthe tool-rest Iis actuated, bythecross-feed'screw L, to move upon the slides a a of theslide-rest, also in the usual manner; but instead of operating thecross-feed screw by a crank handle or hand-wheel, tis-was heretoforedone, I ailix a hanged drum orpwheel, E, to the end of the cross-feedseremos sho'wn, and attach thereto wire or metallic ribbon, b, andconnect Athe latter to some 'suitable lixed point, as the cross-bar J,ailixedto the shears A of the bed-frame in the manner shown, where, whenthe sliderest moves forward in obedience to the longitudinal feed-screw,the wire or ribbon b causes the uniform revolution of the crosslfeedscrew, which feeds up the tool-rest, vand the ltoolwithin thetcol-holder Gr, in a regular manner, thereby cutting or boring therequiredutaper with automatic exactness. i

"vThis invention is equally applicable to lathes furnished with acompound-feed rest, and in either case, all

.thatisrcquisite to apply the-invention is, to affix 'the drum E ou thecross-feed screw inthe place of the ordinary crank-handle, andattach'the cross-bar J or its equivalentto the shears, at any desiredpoint of the latter.

A set-scrcw, d, serves to clamp the end of the-wire or ribbon Z in theobvious manner. The degree of taper to be bored or cut depends upon thediameter of the drumand the-pitch of thethreads oi`. both feed-screws,butin practice, the diameter of the drum onlyneed be consideredfor anyparticular'lathe..

Thisdiameter is readily ascertainable by a simple calculation. l Theface of thedrurn must be suiieientlybroad to preventlthc wire or ribbonfrom riding, and thereby destroying the even character-of thetaper-formed. i Y

I claim as new, and desire to secure by Letters Patent-1,

For operating thc cross-feed screw of a lathe, the combination of thefeed-,screw with the pulley E, band b, bar J or its equivalent, allsubstantially as described.

- LEWIS GRIsGOM.

Witnesses: A

JACOB SHELLEY, T. HARRY BECHTEL.

